Windows Server 2012R2 - Cannot RDP, server hangs at logon from console after pressing CTRL+ALT+DEL

We have several machines that have exhibited this behavior so far. Once they get into this state, the only option is to reboot. They are HP ProLiant BL460c G7 blades.
The behavior exhibited is:
You can no longer RDP to the machine. It just eventually times out.
Console access via iLO shows what you'd expect, asking for CTRL+ALT+DEL, but when you press that, it just goes to the dark blue screen with "Windows Server 2012 R2" written at the bottom and doesn't go further.
There doesn't seem to be any unusual notes in the System Log that I can see.

I've also read the support article that you linked, but that seems to suggest that there is always a problem with RDP and in this case the server gets to a point where it is stuck and requires a reboot to clear.
Hi Mitch,
For the above line of yours seems there is some misunderstanding, as nowhere in the link provided it suggest to restart\reboot the server. But instead need to check the certificate related scenario.
Can you ping the destination server when you can’t perform RDP?
Now for more troubleshooting you can choose performance monitor and can see what is effecting, for that you can go through beneath article.
Troubleshooting Server Hangs - Part One
http://blogs.technet.com/b/askperf/archive/2007/09/25/troubleshooting-server-hangs-part-one.aspx
Hope it helps!
Thanks.
Dharmesh Solanki
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Windows Server 2012R2 - Cannot RDP, server hangs at logon from console after pressing CTRL+ALT+DEL

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